28201332 has 12 divisors (see below), whose sum is σ = 65803136. Its totient is φ = 9400440.

The previous prime is 28201331. The next prime is 28201343. The reversal of 28201332 is 23310282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 28201299 and 28201308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175044 + ... + 1175067.

Almost surely, 2^28201332 is an apocalyptic number.

It is an amenable number.

28201332 is an abundant number, since it is smaller than the sum of its proper divisors (37601804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28201332 is a wasteful number, since it uses less digits than its factorization.

28201332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350118 (or 2350116 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28201332 is about 5310.4926325154. The cubic root of 28201332 is about 304.3849722315.

The spelling of 28201332 in words is "twenty-eight million, two hundred one thousand, three hundred thirty-two".